1. A. V. Arhangel’skii and M. G. Tkachenko, Topological Groups and Related Structures (Atlantis Press, Paris, 2008).
2. M. G. Tkachenko, “Factorization Theorems for Topological Groups and their Applications,” Topol. and Appl. 38 (1), 21 (1991).
3. L. H. Xie and S. Lin, “R-Factorizability and Uniform Continuity in Topological Groups,” Topol. and Appl. 159 (11–12), 2711 (2012).
4. K. L. Kozlov, “R-Factorizable G-Spaces,” Topol. and Appl. (2017).
5. V. V. Uspenskii, “Topological Groups and Dugundji Compacta,” Matem. Sbornik 180 (8), 103 (1989) [Math. of the USSR–Sbornik, 67 (2), 555 (1990)].